PIC: Katherine Heigl has a bun in the oven!

Los Angeles - Katherine Heigl has announced she is pregnant with a baby boy due in January.

The child will be the third for the 37-year-old actress and her 36-year-old husband, musician Josh Kelley. The couple has two adopted daughters, 7-year-old Naleigh Moon and 4-year-old Adelaide Marie Hope.

Heigl announced the good news on Instagram and her lifestyle website. She said she and Kelley are "full of high hopes and bubbling anticipation."